| ??? 10/26/05 07:13 Read: times |
#102958 - use a terminal Responding to: ???'s previous message |
My usual recommendation: first, throw away Flip/FlashMagic/whatever_software_supposed_to_be_smarter_than_you.
Use a plain terminal emulator. Hyperterm will do, but it has a clumsy setup and if you are not really familiar with it, get something better. I like to use terminal by Bray for this kind of job, TeraTerm is my second favorite. Both are free and packed with features. Set some moderate UART speed (e.g. 9600baud or less, depending on the crystal/oscillator you used; 8N1, no handshake). Reset the mcu to the bootloader (PSEN etc. - you don't have /PSEN and /RESET controlled from UART, do you?), press 'U' (with shift or capslock on), it should echo 'U' back if successful autobaud. If it echoes something else, reset again - it may happen ocassionally. Then try typing something like :020000050000F9 - it will echo back the whole and then append a byte and a dot. If it does not, the trouble is somewhere in the COMport-cable-MAX232-mcu chain, the standard troubleshooting is to short Rx and Tx at various spots, starting from the COM port of PC (of course, the remainder disconnected). Btw. you don't use a USB-to-RS232 gadget, do you? Jan Waclawek |
| Topic | Author | Date |
| ISP Help -T89C51AC2 | 01/01/70 00:00 | |
| use a terminal | 01/01/70 00:00 | |
| smarter? | 01/01/70 00:00 | |
| doing things for me = smart | 01/01/70 00:00 | |
| Not personal | 01/01/70 00:00 | |
| Is that not the "most useful" approach ? | 01/01/70 00:00 | |
| Definately | 01/01/70 00:00 | |
| original problem | 01/01/70 00:00 | |
| get an AT chip instead if the discontinu | 01/01/70 00:00 | |
| Nope | 01/01/70 00:00 | |
| is that not the old discontinued, never | 01/01/70 00:00 | |
| broken GND | 01/01/70 00:00 | |
Fixed | 01/01/70 00:00 |